code: def test_get_python_version_tag(self) -> None:
      v = DEFAULT_PYTHON_VERSION
      pv = self.get_python_version(v)
      container = RayDockerContainer(v, "cpu", "ray")
      assert container.get_python_version_tag() == f"-{pv}"
  
file_path: ray/ci/ray_ci/test_ray_docker_container.py
imports: import os
  import sys
  from typing import List
  from unittest import mock
  import pytest
  from ci.ray_ci.builder_container import DEFAULT_PYTHON_VERSION
  from ci.ray_ci.container import _DOCKER_ECR_REPO
  from ci.ray_ci.ray_docker_container import RayDockerContainer
  from ci.ray_ci.test_base import RayCITestBase
  from ci.ray_ci.utils import RAY_VERSION
label_desc: Use image node_id 5 for calling the TestRayDockerContainer obj's underlying member method code with example usage: obj.test_get_python_version_tag() without return types